Make Your Own Remington 870 Extension, Scheme
Remington 870 Extension from Nat_usp from Remington 870 Forum:

Remington 870 Extension Drawing

Remington 870 Extension

Remington 870 Extension

Remington 870 Extension

Remington 870 Extension

Remington 870 Extension
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Magazine Extensions for Remington 870 Shotgun (Nordic Components, Choate, TacStar, Remington, ATI)
Remington 870 pump action